Class iii cavity preparation facial access

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C and D, Class IV. The advantages of restoring the proximal lesion using a lingual approach are as follows: A lingual access preparation on the distal surface of the maxillary canine is described here because the use of amalgam in that location is more likely. Some unsupported, but non-friable, enamel may be left on the facial wall of the preparation. A, Position of No. In the rare cases where additional retention form is needed, it can be achieved either by increasing the surface area with a wider enamel bevel or by adding retentive features in the preparation internal walls.

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D, Tooth preparation completed, except for the final finishing of the enamel margins and placing the retention form.

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9: Class III, IV, and V Direct Composite and Glass Ionomer Restorations

The external walls are prepared perpendicular to the root surface. Little may need to be done in the final tooth preparation stage for these preparations. When isolation is accomplished with the rubber dam, wedge placement may be aided by a small amount of water-soluble lubricant on the tip of the wedge. In all of these instances, the operating area must be isolated adequately to attain an effective bond. When possible, it is best to leave the incisal margin in contact with the adjacent tooth.

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class iii cavity preparation facial access
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